Documentation: DatatypeContexts is NOT on by default in 7.4.1
This page: http://www.haskell.org/ghc/docs/7.4.1/html/users_guide/data-type-extensions.html
Claims that data type contexts are on by default, but this does not seem to be the case.
For example:
$ ghci
GHCi, version 7.4.1: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> data (Functor f) => Blah f = Blah f
<interactive>:2:6:
Illegal datatype context (use -XDatatypeContexts): Functor f =>
Trac metadata
Trac field | Value |
---|---|
Version | 7.4.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Documentation |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |